The client now holds a list of accessible scopes.
Tidy the way we fetch scopes.
Display the scope selector where appropriate.

Make sure that twsetup doesn't overwrite custom localize entries with
default ones.
Return the optional scid with copy and port actions.
Ability to copy a link at a different scope.
Ability to *use* a link to a different scope.
"Delete portal" menu option.
Catch rendering errors in room/locale description creation.
Log error messages when throwing script-runaway exceptions.